if (typeof Crypto == "undefined" || ! Crypto.util)
{
(function(){

var base64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

// Global Crypto object
var Crypto = window.Crypto = {};

// Crypto utilities
var util = Crypto.util = {

        // Bit-wise rotate left
        rotl: function (n, b) {
                return (n << b) | (n >>> (32 - b));
        },

        // Bit-wise rotate right
        rotr: function (n, b) {
                return (n << (32 - b)) | (n >>> b);
        },

        // Swap big-endian to little-endian and vice versa
        endian: function (n) {

                // If number given, swap endian
                if (n.constructor == Number) {
                        return util.rotl(n,  8) & 0x00FF00FF |
                               util.rotl(n, 24) & 0xFF00FF00;
                }

                // Else, assume array and swap all items
                for (var i = 0; i < n.length; i++)
                        n[i] = util.endian(n[i]);
                return n;

        },

        // Generate an array of any length of random bytes
        randomBytes: function (n) {
                for (var bytes = []; n > 0; n--)
                        bytes.push(Math.floor(Math.random() * 256));
                return bytes;
        },

        // Convert a byte array to big-endian 32-bit words
        bytesToWords: function (bytes) {
                for (var words = [], i = 0, b = 0; i < bytes.length; i++, b += 8)
                        words[b >>> 5] |= bytes[i] << (24 - b % 32);
                return words;
        },

        // Convert big-endian 32-bit words to a byte array
        wordsToBytes: function (words) {
                for (var bytes = [], b = 0; b < words.length * 32; b += 8)
                        bytes.push((words[b >>> 5] >>> (24 - b % 32)) & 0xFF);
                return bytes;
        },

        // Convert a byte array to a hex string
        bytesToHex: function (bytes) {
                for (var hex = [], i = 0; i < bytes.length; i++) {
                        hex.push((bytes[i] >>> 4).toString(16));
                        hex.push((bytes[i] & 0xF).toString(16));
                }
                return hex.join("");
        },

        // Convert a hex string to a byte array
        hexToBytes: function (hex) {
                for (var bytes = [], c = 0; c < hex.length; c += 2)
                        bytes.push(parseInt(hex.substr(c, 2), 16));
                return bytes;
        },

        // Convert a byte array to a base-64 string
        bytesToBase64: function (bytes) {

                // Use browser-native function if it exists
                if (typeof btoa == "function") return btoa(Binary.bytesToString(bytes));

                for(var base64 = [], i = 0; i < bytes.length; i += 3) {
                        var triplet = (bytes[i] << 16) | (bytes[i + 1] << 8) | bytes[i + 2];
                        for (var j = 0; j < 4; j++) {
                                if (i * 8 + j * 6 <= bytes.length * 8)
                                        base64.push(base64map.charAt((triplet >>> 6 * (3 - j)) & 0x3F));
                                else base64.push("=");
                        }
                }

                return base64.join("");

        },

        // Convert a base-64 string to a byte array
        base64ToBytes: function (base64) {

                // Use browser-native function if it exists
                if (typeof atob == "function") return Binary.stringToBytes(atob(base64));

                // Remove non-base-64 characters
                base64 = base64.replace(/[^A-Z0-9+\/]/ig, "");

                for (var bytes = [], i = 0, imod4 = 0; i < base64.length; imod4 = ++i % 4) {
                        if (imod4 == 0) continue;
                        bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & (Math.pow(2, -2 * imod4 + 8) - 1)) << (imod4 * 2)) |
                                   (base64map.indexOf(base64.charAt(i)) >>> (6 - imod4 * 2)));
                }

                return bytes;

        }

};

// Crypto mode namespace
Crypto.mode = {};

// Crypto character encodings
var charenc = Crypto.charenc = {};

// UTF-8 encoding
var UTF8 = charenc.UTF8 = {

        // Convert a string to a byte array
        stringToBytes: function (str) {
                return Binary.stringToBytes(unescape(encodeURIComponent(str)));
        },

        // Convert a byte array to a string
        bytesToString: function (bytes) {
                return decodeURIComponent(escape(Binary.bytesToString(bytes)));
        }

};

// Binary encoding
var Binary = charenc.Binary = {

        // Convert a string to a byte array
        stringToBytes: function (str) {
                for (var bytes = [], i = 0; i < str.length; i++)
                        bytes.push(str.charCodeAt(i) & 0xFF);
                return bytes;
        },

        // Convert a byte array to a string
        bytesToString: function (bytes) {
                for (var str = [], i = 0; i < bytes.length; i++)
                        str.push(String.fromCharCode(bytes[i]));
                return str.join("");
        }

};

})();
}